+# topdir is where builder script lives,
+# fallback to old style if SPECS/SOURCES dirs were found.
+%_topdir %{expand:%%global _topdir %(
+ if [ -d SPECS -a -d SOURCES ]; then
+ # old style rpmdir: in topdir
+ pwd
+ elif [ -d ../SPECS -a -d ../SOURCES ]; then
+ # old style rpmdir: in subdir
+ cd ..; pwd
+ elif [ -d $HOME/rpm/SPECS -a -d $HOME/rpm/SOURCES ]; then \
+ # if old style rpm dir exist, go with it
+ echo $HOME/rpm; \
+ elif [ -x ../builder -a ! -d ../builder ]; then
+ # relative new style rpmdir: in package dir
+ cd ..; pwd
+ elif [ -x builder -a ! -d builder ]; then
+ # relative new style rpmdir: in packages
+ pwd
+ elif [ -x packages/builder -a ! -d packages/builder ]; then
+ # relative new style rpmdir: packages dir in current dir
+ cd packages; pwd
+ else
+ # fallback to new style rpmdir
+ echo $HOME/rpm/packages
+ fi; \
+)}%_topdir
+
+# if %{_topdir}/SPECS exists, it's old style structure
+%_specdir %{expand:%%global _specdir %([ ! -d %{_topdir}/SPECS ] && echo %{_topdir}/%{name} || echo %{_topdir}/SPECS)}%_specdir
+%_sourcedir %{expand:%%global _sourcedir %([ ! -d %{_topdir}/SOURCES ] && echo %{_specdir} || echo %{_topdir}/SOURCES)}%_sourcedir
+
+# BUILD/RPMS/SRPMS are one same level by default as packages dir, if these exist
+# if they don't exist assume we are having custom topdir (which is not named as
+# "packages", i.e ~/rpm/kde/{kdelibs,BUILD/RPMS/SRPMS})
+# NOTE: readlink fails if some parent dir is not readable (/home/services/builder for example can't read /home/services), therfore the extra echo
+%_builddir %{expand:%%global _builddir %(if [ -d %{_topdir}/BUILD ]; then echo %{_topdir}/BUILD; else readlink -m %{_topdir}/../BUILD || echo %{_topdir}/../BUILD; fi)}%_builddir
+%_rpmdir %{expand:%%global _rpmdir %(if [ -d %{_topdir}/RPMS ]; then echo %{_topdir}/RPMS; else readlink -m %{_topdir}/../RPMS || echo readlink -m %{_topdir}/../RPMS; fi)}%_rpmdir
+%_srcrpmdir %{expand:%%global _srcrpmdir %(if [ -d %{_topdir}/SRPMS ]; then echo %{_topdir}/SRPMS; else readlink -m %{_topdir}/../SRPMS || echo readlink -m %{_topdir}/../SRPMS; fi)}%_srcrpmdir